drupal views 2 expose sort criteria

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my question is how we can expose sort criteria in views 2 drupal. i have a list of cars as a result of search block (exposed filter).i need to add a select box to sort the cars. this is my views theme ""

<div id="listing">

<?php

//Product Line Page

$num = count($rows);

print "<h2>".$num."Cars found</h2>";?>

<div id="compare_link"><a href="<?php echo base_path(); ?>comparison">Compare</a></div>

<?php

$i=0;foreach ($rows as $count => $row){ $i++;

foreach ($row as $field => $content){ 

//print $fields[$field]."<br>";


switch($fields[$field]){

case 'ops':$compare=$content;break;

case 'field-image-fid': $image = $content; break;

case 'tid': $title = $content; break;

case 'field-counter-value': $counter = $content; break;

case 'field-exteriorcolor-value':$color=$content;break;

case 'title-1':$link=$content;break;

case 'field-year-value':$year=$content;break;

case 'field-bodystyle-value': $body_style = $content; break;

case 'field-price-value': $price = $content; break;

case 'field-country-2-value':$country_image =$content; break;

case 'field-logo-fid': $logo = $content; break;

case 'edit-node':$edit=$content;break;
}
}


?>
<?php if ($color==""){$color="Color";} ?>

<?php if ($body_style==""){$body_style="Body";} ?>

<?php 

$array_title = split("/",$title);

?>


<div id="one_list" class="one_list_<?php echo $i ?>">

<div id="compare"><?php print $compare; ?></div>

        <div class="list_left_image"><?php print $image  ?></div>

        <div class="list_middle_text">

                        <div class="list_title"><?php print $array_title[1]."&nbsp;".$array_title[0]."&nbsp;"  ?>(<?php print $year  ?>)</div>


                        <div class="list_desc"><?php print $counter."&nbsp;"  ?>/<?php print $counter*0.62."MIL,&nbsp;"  ?>,<?php print $color.",&nbsp;"  ?><?php print $body_style ?></div>

                        <?php if ($i<10) {?>

                        <div id="country_image"><?php print $country_image; ?></div><div id="new_car"></div>

<? } ?>

                        <div class="read_more"><?php print $link ?></div>

        </div>

        <div class="list_right_contact"><div class="price_list"><?php if($price==""){print ("Price On Request"); }else{ print ($price);}?></div><div class="logo_image"><?php print $logo ?></div><div class="seller">Seller's other items</div></div>
</div>
<?php if ($i%5==0) {?>
<div id="section_banner" class="banner<?php print $i ?>"></div>
<? } ?>
<? } ?>

</div>

* so what i need to know is how can i give the ability for the visitors to sort these cars according to the date and price thanks for help